161,046 research outputs found
Propriétés optiques de la chervétite, pyrovanadate de plomb
No full textDetermination of the optical constants and of the optical axial angle of chervetite Pb₂V₂O₇, by measurement of reflectances on orientated natural faces.Détermination des constantes optiques et de l'angle des axes optiques de la chervétite Pb₂V₂O₇, par la mesure des pouvoirs réflecteurs de faces orientées d'un monocristal.Cervelle Bernard, Cesbron Fabien. Propriétés optiques de la chervétite, pyrovanadate de plomb. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 96, 6, 1973. pp. 391-392
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Larry O. Spencer, Conference Author Presentation
No full textGen. Larry O. Spencer, USAF (Ret.), author of Dark Horse: A Journey from the Horseshoe to the Pentago
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Structure cristalline de l'uranyl˗vanadate de nickel tétrahydraté Ni(UΟ2)2(VΟ4)2. 4H2Ο
No full textThe crystal structure of Ni(UO₂)₂ (VO₄)₂ • 4H₂O has been solved using three-dimensional X-ray diffraction data obtained with an automatic dif-fractometer. The space group is Pnam. The final R factor is 0.069 with anisotropic thermal parameters for the cations and isotropic factors for the oxygen atoms.
The crystal is built up by [(UO₂) ₂ V₂O₈]n[charged 2n-] slabs parallel to (001) which contain symmetry centers. Nickel atoms and the four water molecules linked to them lie in the mirror plane. The octahedron of oxygen around nickel is completed by oxygens from, uranyl group symmetrically related by the mirror plane.La structure cristalline de Ni(UO₂)₂ (VO₄)₂ • 4H₂O a été résolue à l'aide des données de diffraction des rayons X à trois dimensions, mesurées à l'aide d'un diffractomètre automatique Nonius.
Le groupe spatial est Pnam. Le facteur R obtenu est égal à 0,069 avec les facteurs d'agitation thermique anisotrope pour les cations et isotrope pour les atomes d'oxygène.
Le cristal est contitué par des feuillets [(UO₂) ₂ V₂O₈]n[chargés 2n-] parallèles au plan (001) contenant les centres de symétrie. Les atomes de nickel et les quatre molécules d'eau qui lui sont liées sont dans les miroirs non translatoires. L'octaèdre de coordination des atomes d'oxygène entourant le nickel est complété par l'un des atomes d'oxygène appartenant au groupement uranyle et son symétrique par rapport au miroir non translatoire.Borène Jacques, Cesbron Fabien. Structure cristalline de l'uranyl˗vanadate de nickel tétrahydraté Ni(UΟ2)2(VΟ4)2. 4H2Ο. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 93, 4, 1970. pp. 426-432
Nouvelles données sur la vanuralite. Existence de la méta˗vanuralite
No full textA detailed study of vanuralite has shown that a less hydrated form exists, meta-vanuralite, the transformation from one to the other being reversibly dependent on the humidity of the atmosphere.
Vanuralite Al (UO₂)₂ (VO₄)₂ (OH) . 11H₂O is monoclinic A2/a with a = 10.55 Å, b = 8.44 Å, c = 24.52 Å and β = 103° and with Z = 4. The main powder lines with indices are 11.98 (vvs) 002, 5.98 (vs) 004, 3.795 (s) 006-022, 3.231 (s) 31[-1], 3.180 Å (s) 31[-3]. A twin by pseudosymmetry exists with composition plane (001).
Meta-vanuralite Al (UO₂)₂ (VO₄)₂ (OH).8H₂O is triclinic with a = 10.46 Å, b = 8.44 Å, c = 10.43 Å, α = 75° 53', β = 102° 50', γ = 90° and with Z = 2. The main powder lines with indices are 9.02 (vvs) 001, 4.174 (vs) 021, 4.086 (s) 020-102, 3.240 (s) [-3]11, 3.155 (vs) 221-311, 3,073 Å (s) 3[-1]0-22[-1].
The transition from a monoclinic to a triclinic cell occurs by reduction of the distance between the perfect (001) cleavage planes and slip parallel to the 6-axis.
Meta-vanuralite (8H₂O) is stable at 20° C in an atmosphere of relative humidity between 47 and 28 %.L'étude détaillée de la vanuralite a montré qu'il existait une forme moins hydratée, la méta-vanuralite, le passage de l'une à l'autre étant réversible et dépendant du degré hygrométrique de l'atmosphère.
La vanuralite Al (UO₂)₂ (VO₄)₂ (OH) . 11H₂O est monoclinique A2/a avec les paramètres a = 10,55 Å, b = 8,44 Å, c = 24,52 Å and β = 103° et Z = 4. Les raies principales du diagramme de poudre indexé sont : 11,98 (FFF) 002, 5,98 (FF) 004, 3,975 (F) 006-022, 3,231 (F) 31[-1], 3,180 (F) 31[-3]. Il existe une macle par pseudo-symétrie avec accolement suivant (001).
La méta-vanuralite Al (UO₂)₂ (VO₄)₂ (OH) . 8H₂O est triclinique avec a = 10,46 Å, b = 8,44 Å, c = 10,43 Å, α = 75° 53', β = 102° 50', γ = 90° et Z = 2. Les raies principales du diagramme de poudre indexé sont : 9,92 (FFF), 001, 4,174 (FF), 021, 4,086 (F) 020-102, 3,240 (F) [-3]11, 3,155 (FF) 221-31[-1], 3,073 (F) 3[-1]0-22[-1].
Le passage de la maille monoclinique à la maille triclinique s'effectue par diminution de la distance entre les plans (001) (clivage parfait) et glissement parallèlement au paramètre b.
La méta-vanuralite est stable (8H₂O) à 20° C dans une atmosphère dont le degré d'humidité relative est compris entre 47 et 28 %.Cesbron Fabien. Nouvelles données sur la vanuralite. Existence de la méta˗vanuralite. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 93, 2, 1970. pp. 242-248
La bariandite, nouvel oxyde hydraté de vanadium (IV) et (V)
No full textBariandite a new hydrated vanadium oxide IV and V.
Bariandite V₂O₄ • 4V₂O₅ • 12H₂O was found in mineralized sandstones of the uranium-vanadium deposit at Mounana, Gabon, associated with duttonite VO (OH)₂ and lenoblite V₂O₄ • 2H₂O. It is monoclinic, pseudo-orthorhombic, with a = 11.70 Å, b = 3.63 Å, c = 29.06 Å, β = 101° 30' and Z = 2 ; space group : Cc or C2 lc. Bariandite is distinguishable from corvusite V₂O₄ • 6V₂O₅ • nH₂O by its powder pattern : 14.20 Å (vvs) 002 ; 5.72 (m) 200-20[-2] ; 3.480 (s) 110-11[-1] ; 3.430 (s) 111-11[-2] ; 2.852 (m) 400-40[-4].
Crystals are elongated on [010] with a perfect cleavage (001). The measured specific gravity is 2.7 and the refractive indices greater than 1.85. The chemical analysis gave : V₂O₅ = 63.26 %, V₂O₄ = 14.19 %, Fe₂O₃ = 0.17 % Al₂O₃ = 3.75 %, H₂O = 18.11 %, sum = 100,08 %.
At 20° C, composition V₂O₄ . 4V₂O₅ • 12H₂O is obtained, under partial pressure of water vapour, betweed 14 and 5 mm Hg. Differential thermal analysis curve shows two endothermic breaks at 100° C and 135° C (dehydration) and another at 676° C corresponding to melting of V₂O₅La bariandite V₂O₄ • 4V₂O₅ • 12H₂O a été trouvée dans les grès minéralisés du gisement d'uranium et de vanadium de Mounana, Gabon, associée à la duttonite VO (OH)₂ et à la lenoblite V₂O₄ • 2H₂O. Elle est monoclinique pseudo˗orthorhombique avec a = 11,70 Å, b = 3,63 Å, c = 29,06 Å, β = 101° 30' et Z = 2 ; groupe spatial Cc ou C2/c. Son diagramme de poudre la distingue de la corvusite V₂O₄ • 6V₂O₅ • nH₂O : 14,20 (FFF) 002 ; 5,72 (mF) 200-20[-2] ; 3,480 (F) 110-11[-1] ; 3,430 (F) 111-11[-2] ; 2,852 (mF) 400-40[-4].
Les cristaux sont allongés suivant [010] et présentent un clivage parfait (001) ; la densité est égale à 2,7 et les indices de réfraction supérieurs à 1,85. L'analyse chimique a donné : V₂O₅ = 63,26 %, V₂O₄ = 14,19 %, Fe₂O₃ = 0,17 %, Al₂O₃ = 3,75 %, 3,75 %, H₂O = 18,11 %, total = 100,08 %.
A 20° C la composition V₂O₄ . 4V₂O₅ • 12H₂O est obtenue sous une pression partielle de vapeur d'eau comprise entre 14 et 5 mm Hg. La courbe d'analyse thermique différentielle présente deux pics endothermiques à 100 et 135° C correspondant à la déshydratation et un autre à 676° C dû à la fusion de V₂O₅.Cesbron Fabien, Vachey Hélène. La bariandite, nouvel oxyde hydraté de vanadium (IV) et (V). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 94, 1, 1971. pp. 49-54
Author Under Sail The Imagination of Jack London, 1902-1907
No full textIn this second volume of Author Under Sail Jay Williams investigates the life of Jack London as a professional writer at the turn of the 1900s, as his publications spanned The Call of the Wild to The Iron Heel and The Road. While documenting key life events, especially his rising fame, this biography explores London's necessity to illustrate the inner workings of his own vast imagination through his socialist essays and fiction.Cover -- Title Page -- Copyright Page -- Contents -- Acknowledgments -- Introduction -- 1. Howl, O Heav'nly Muse! -- 2. Jesus in the Theater of Socialism -- 3. Jack London's Place in American Literature -- 4. Theater of War, Theater at Home -- 5. Revolution, Evolution, and the Scene of Writing -- 6. The Jack London Show Goes on the Road -- 7. Red Atavisms and Revolution -- 8. Earthquake Apocalypse and Building the City, Boat, and House Beautiful -- 9. The Future of Socialism and the Death of the Individual -- 10. The Road Never Ends -- Notes -- Bibliography -- IndexIn this second volume of Author Under Sail Jay Williams investigates the life of Jack London as a professional writer at the turn of the 1900s, as his publications spanned The Call of the Wild to The Iron Heel and The Road. While documenting key life events, especially his rising fame, this biography explores London's necessity to illustrate the inner workings of his own vast imagination through his socialist essays and fiction.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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